A093345 - cp's OEIS frontend

A093345 a(n) = n! * {1 + Sum[i=1..n, 1/i*Sum(j=0..i-1, 1/j!)]}.

n	a(n)
0	1
1	2
2	6
3	23
4	108
5	605
6	3956
7	29649
8	250892
9	2367629
10	24662700
11	281153801
12	3482350724
13	46572620757
14	668943488084
15	10271127486065
16	167892667249116
17	2911049382788189
18	53365747562592092
19	1031352659792534169

[1, 2, 6, 23, 108, 605, 3956, 29649, 250892, 2367629, 24662700, 281153801, 3482350724, 46572620757, 668943488084, 10271127486065, 167892667249116, 2911049382788189, 53365747562592092, 1031352659792534169]

cp's OEIS Frontend

A093345 a(n) = n! * {1 + Sum[i=1..n, 1/i*Sum(j=0..i-1, 1/j!)]}.

Table of values

List of values